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The influence of electrolyte media on the cathodic stripping voltammetry of lead dioxide on glassy carbon electrode
Author(s) -
Velayutham D.,
Noel M.
Publication year - 1994
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140060214
Subject(s) - perchloric acid , chemistry , cathodic stripping voltammetry , nitric acid , stripping (fiber) , inorganic chemistry , electrolyte , cyclic voltammetry , supporting electrolyte , lead dioxide , anodic stripping voltammetry , glassy carbon , voltammetry , acetic acid , buffer solution , electrochemistry , electrode , chromatography , materials science , organic chemistry , composite material
The influence of three electrolyte media, namely, acetate buffer, nitric acid, and perchloric acid, on cathodic stripping of lead dioxide at a glassy carbon electrode (GCE) was studied using cyclic voltammetry (CV) and linear sweep stripping voltammetry (LSSV) techniques. One M acetic acid/1 M sodium acetate, 0.1 M nitric acid, and 0.1 M perchloric acid were found to give a sharp cathodic stripping voltammetric (CSV) response. Various factors, such as concentration of supporting electrolyte, depositior, potential ( E dep ) deposition time ( t dep ), and concentration of Pb 2+ ( C pb 2+ ), are also presented and discussed. The lowest detection limit of Pb 2+ in acetate buffer is 5 × 10 −8 M and, in 0.1 M nitric acid and 0.1 M perchloric acid, is 1 × 10 −5 M. The influence of medium on cathodic stripping peak broadening is analyzed in detail. It is concluded that the formation of insoluble intermed ates is the major cause for peak broadening, and the ability of the supporting electrolyte anion to inhibit the formation of such intermediates, through complexation, is the major reason for sharper stripping voltammetry response.